<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,height=device-height, initial-scale=1.0">
    <title></title>

    <link rel="stylesheet" href="http://172.17.149.196:8080/bootstrap/bootstrap-3.3.5/dist/css/bootstrap.css"/>
    <script src="http://172.17.149.196:8080/jquery/jquery-2.1.3.min.js"></script>
    <script src="../js/bootstrap.min.js"></script>

</head>
<body>
<div class="container">
    <table class="table">
        <thead>
        <tr>
            <th>a</th>
            <th>b</th>
            <th>c</th>
        </tr>
        </thead>
        <tbody>
        <tr>
            <td colspan="3">
                <div>
                    <table class="table" style="height: 2px">
                        <tr>
                            <td>1</td>
                            <td>2</td>
                            <td>3</td>
                        </tr>
                        <tr>
                            <td>1</td>
                            <td>2</td>
                            <td>3</td>
                        </tr>
                        <tr>
                            <td>1</td>
                            <td>2</td>
                            <td>3</td>
                        </tr>
                        <tr>
                            <td>1</td>
                            <td>2</td>
                            <td>3</td>
                        </tr>
                        <tr>
                            <td>1</td>
                            <td>2</td>
                            <td>3</td>
                        </tr>
                        <tr>
                            <td>1</td>
                            <td>2</td>
                            <td>3</td>
                        </tr>

                    </table>
                </div>
            </td>
        </tr>
        </tbody>
    </table>

</div>

</body>
</html>